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The black tank can be flushed two or three times by following this procedure (after set-up, of course):  Dump black; turn off macerator, leaving black valve open; open gray valve (to run some of that water into the black tank); close gray valve and run macerator (helps clean the black tank); open gray valve (again allowing gray water into the black tank); close gray valve; run macerator again; if there is enough water left in the gray tank, open gray valve again, close and repeat procedure; close black valve; run macerator and drain gray tank; hook up flushing hose to black tank flush; open black valve; run macerator.  After a short while, the water from the black tank will run relatively cleanly.  Shut off and pack up hose.  This will not work, of course, if the top of the gray tank is lower than the bottom of the black tank (ever seen that?).

I believe many dumping problems arise when people leave their valves open when camped, contravening the natural force of gravity in helping to dump, and allowing buildup of "materials" to occur in the black tank, a buildup that can only be moved by some force beyond that of gravity.  Let that tank get pretty full and the problems will be minimized.

A further convenience is the expandability of the hose.  With a hose extension, one can run a line for 40-50 feet.  We do that so that we can head into most camping spaces, allowing us to look at the scenery rather than a sea of coaches.  Does put the hookups on the wrong side, of course.  That's why we need extensions.  The macerator pump will easily deliver waste matter that far, uphill or not.